Lens



Jan. 19 1926.

- F. K. GOETTERT LENS Filed July '30, 1923 A TTORNEYS.

Patented Jan. 19, 1926.

UNITED STATES PATENT OFFICE.

LENS.

Application filed July 30,,1923. Serial 1105655750.

T '0 allivho-m it may concern: Be it known that I, FRIEDRICH K. Gom- TERT, a citizen of Germany, and a resident of San Francisco, county of San Francisco, State of California, have invented a new and useful Lens, of which the following is a specificationr The present invention relates to improvements in lenses and has particular reference to a lens adapted to be used in connection with the headlights of motor vehicles for diffusing the light so as to eliminate the glare while at the same time increasing the range of the light. My lens may also be used for a magnifying glass for search lights and in other connections. It is par- 7 ticularly proposedto provide a lens that instead of being made of solid glass or similar material is made hollow and filled with a suitable liquid allowing the rays to pass therethrough. I I

The preferred form of my invention is illustrated in the accompanying drawing in which Figure 1 shows a front view of my lens, Fi ure 2 a verticalsection through the same ta en along line 11-11 of Figure 1, Figure 3 a vertical section through the head light of a motor vehicleemploying my lens; Figure 4 a vertical section through a lens of a different form; and Figure 5 a similar section through a further modified form. \Vhile I have shown only the preferred forms of my invention, it should be understood that various changes or modifications may bemade within the scope of the claims hereto attached without departing from the spirit of the invention.

My lens (1) comprises a receptacle (2 made of lens sha e, either biconvex as shown in Figure 2, or. iconcave as shown in Figure 4, or of any other suitable form, filled with a liquid The latter liquid is pref.- erably a mixture of pure water with salt and glycer ine. Three pints of water are mixed with one pint of salt and allowed to boil soas to dissolve the salt, whereupon the mixtureis cooled off gradually. Glycer-i ine in the proportion of one part of glycerine toeight parts of the salt water is added to keep the salt from crystallizing. It will be understood that the salt is added to the water for the purpose of preventing the same from freezing. In countries where there is little or no frost ordinary distilled water may be used.

The receptacle is provided with a central aperture (4) through which he liquid .is introduced and which is adapted to be closed by means of a stopper (6). The receptacle is further provided with a circumferential flange (7) which allows the same to be held betweeh two clamping members.

In' Figure 3 my lens is shown in connec- 7 tion with a headlight comprising the housing (8) having an internal flange (9) at its front end, a light (11) mounted therein. in the customary manner and a reflector (12) having an external flange (13) against which the flange (7) of the lens may be placed, which latter is securely held by means of a link (14) introduced between the same and the flange (9) of the housing. The stopper (6) previously mentioned. is dis osed immediately in front of the light. l1) and absorbs the rays emanating directly from the light (11) whereby the glare. of

the headlight is reduced considerably.

If desired the liquid in' the receptacle [may be made colored toappear, red, blue or green.-

A modified form of lens is shown in Figure 5 in which a spherical receptacle (16) for the liquid is provided with a flange (17) surrounding the same. The sphere may be made complete or with an indenture as shown at (18).

I claim:

A lens comprising a'lens-shaped re eptacle of transparent material filled with a transparent liquid having means thereon allowing the same'to be secured in frontof a vehicle headlight and having a central aperture allowing the lens to be filled therethrough and a stopper for closing the aperture, the aperture and the stopper. being disposed to absorb light rays emanating from the headli ht. j F IEDRICH K. GQETTERT. 

